It took me some time to learn about the Google Calendar API V3 and I have encountered some problems. So it is necessary to summary the steps, just take the 'event list' as an example. The event list API is here:https://developers.google.co

it took me some time to learn about the google calendar api v3 and i have encountered some problems. so it is necessary to summary the steps, just take the 'event list' as an example.

The event list API is here: https://developers.google.com/google-apps/calendar/v3/reference/events/list

Details of using OAuth 2.0 for Login is here: https://developers.google.com/accounts/docs/OAuth2Login

Assumption: you have alreay registered your app and turn the Calendar API 'ON' in the 'API & auth' sidebar.

Note: The request needs authorization and I use OAuth 2.0, here are the steps.

Step 1.  Send an Authentication Request to Google

HTTP GET: https://accounts.google.com/o/oauth2/auth?

client_id=XXXXXXXXX&

response_type=code&

scope=https://www.googleapis.com/auth/calendar&

redirect_uri=XXXXXXXXX&

login_hint=XXXXXX

client_id: can be seen in your Google Cloud Console.

redirect_uri: also in your Google Cloud Console, you must write it down in your registered apps page.

login_hint=google account

Then your will find the code parameter in the redirect uri.

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Step 2. Exchange Code for Access Token and ID Token

Use the code you got in the last step to post request. The actual request might look like:

POST /o/oauth2/token HTTP/1.1
Host: accounts.google.com
Content-Type: application/x-www-form-urlencoded

code=4/P7q7W91a-oMsCeLvIaQm6bTrgtp7&
client_id=8819981768.apps.googleusercontent.com&
client_secret={client_secret}&
redirect_uri=https://oauth2-login-demo.appspot.com/code&
grant_type=authorization_code

I use the Chrome Plugin Rest Client to post the request and get access token.

Then you will get the access_token in the response.

Step 3. Get Events List NOW!

https://www.googleapis.com/calendar/v3/calendars/{your calendar id}/events?

code=XXXXXX&

client_id=XXXXXX&

client_secret=XXXXXX&

redirect_uri=XXXXX&

grant_type=authorization_code

&access_token=XXXXXXXX

{your calendar id} is your google account, looks like XXX@gmail.com

Then you will get the JSON response!